I think we have a fight on our hands.
And, for the record? I can’t BELIEVE it’s about point of view.
I agree with Bob that most of us learn that the omniscient point of view is meant to be a "God's eye" view. I think, however, the mistake is thinking one is actually meant to take on the part of God (or the Goddess), if you will, and not have any opinion about what's being portrayed in the story you are telling. The omniscient narrator is a narrator and a participant in the story, just as a limited third-person narrator would be. This is not just my opinion.
This definition comes from NYU’s class on English reading & writing. Citation: http://www.nyu.edu/classes/op/writing/old_pointofview1.htm
Omniscient Point of View:
"The story is told by the author, using the third person, and his knowledge and prerogatives are unlimited. He can interpret the behavior of his characters; he can comment, if he wishes, on the significance of the story he is telling.
It offers a constant danger that the author may come between the reader and the story, or that the continual shifting of viewpoint from character to character may cause a breakdown in coherence or unity. Used skillfully, it enables the author to achieve simultaneous breadth and depth. Unskillfully used, it can destroy the illusion of reality, which the story attempts to create."
The implication here is very obviously that there is a narrator, a commentator—with a personality (likely the author's)—who is telling the story in omniscient point of view. In fact, as said above, the biggest danger is that the story will suffer from "his" intrusion -- that the narrator will be too present.
Again, I will agree that the solution to this is not to pepper one's prose with "I supposed" or "I consider" or other wishy-washy language. It is imperative that the narrative voice make some kind of stand, posit some kind of opinion. That is what narrative voice does. It should, in point of fact, be the expression of the character's opinions, their feeling, and their general take on the scene or whatever.